linux-kernel - Re: [PATCH v8 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and CONFIG_XEN

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Date:   Fri, 7 Dec 2018 14:58:48 +0100
From:   Juergen Gross <jgross@...e.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Maran Wilson <maran.wilson@...cle.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
        kvm@...r.kernel.org
Cc:     tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
        boris.ostrovsky@...cle.com, jpoimboe@...hat.com,
        kirill.shutemov@...ux.intel.com, bp@...e.de,
        thomas.lendacky@....com, luto@...nel.org,
        dave.hansen@...ux.intel.com, roger.pau@...rix.com,
        rkrcmar@...hat.com, rdunlap@...radead.org
Subject: Re: [PATCH v8 1/7] xen/pvh: Split CONFIG_XEN_PVH into CONFIG_PVH and
 CONFIG_XEN_PVH

On 07/12/2018 14:52, Paolo Bonzini wrote:
> On 07/12/18 14:50, Juergen Gross wrote:
>> The PVH boot entry is in the same bzImage binary as the normal one.
>> Its just another entry, similar to the Xen PV boot entry. So the binary
>> arch/x86/boot/bzimage can be booted either on bare metal via grub2 or
>> other boot-loaders, as Xen PV-guest, as Xen PVH-guest, or as KVM
>> PVH-guest. So one build and one binary. The non-standard boot entries
>> (PV- or PVH-node) are found via ELF-notes by the boot loader (qemu in
>> case of KVM).
>>
> 
> But the bzImage is not an ELF binary, and it is compressed, isn't it?
> /me is confused. :)

grub2 (and qemu, too) can decompress it. And the decompressed result
"vmlinux" is an ELF-binary.


Juergen